.TH std::chrono::year::operator+=,std::chrono::year::operator-= 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
std::chrono::year::operator+=,std::chrono::year::operator-= \- std::chrono::year::operator+=,std::chrono::year::operator-=

.SH Synopsis
   constexpr std::chrono::year& operator+=( const std::chrono::years& \fB(1)\fP \fI(since C++20)\fP
   y ) noexcept;
   constexpr std::chrono::year& operator-=( const std::chrono::years& \fB(2)\fP \fI(since C++20)\fP
   y ) noexcept;

   Adds or subtracts y.count() years from the year value.

   1) Equivalent to *this = *this + y;.
   2) Equivalent to *this = *this - y;.

.SH Return value

   A reference to this year after modification.

.SH Notes

   If the result would be outside the range [-32767, 32767], the actual stored value is
   unspecified.

.SH Example


// Run this code

 #include <chrono>
 #include <iostream>

 int main()
 {
     using namespace std::literals::chrono_literals;
     std::cout << std::boolalpha;

     std::chrono::year y{2020};

     y += std::chrono::years(12);
     std::cout << (y == 2032y) << ' ';

     y -= std::chrono::years(33);
     std::cout << (y == 1999y) << '\\n';
 }

.SH Output:

 true true

.SH See also

   operator++
   operator++(int) increments or decrements the year
   operator--      \fI(public member function)\fP
   operator--(int)
   operator+       performs arithmetic on years
   operator-       \fI(function)\fP
   (C++20)
